Jefferson County - East-West Gateway Coordinating Council

A Regional Overview All-Hazard Mitigation Plan
hazards are addressed in the proposal and planning stages of the development process.
Stormwater regulations that the county will soon be adopting and those of seven
responding municipalities are designed to minimize the harmful physical and economic
effects of erosion, sedimentation, and flooding from stormwater runoff. This is
accomplished through the requirement of measures to mitigate erosion, both during and
after construction; the detention and controlled discharge of the differential runoff from
the development; and a well-designed stormwater conveyance system.
Missouri statute RSMo 319.203 requires that cities and counties in the Level VII earthquake
zone pass “an ordinance of order” regarding earthquake preparedness and building
requirements demonstrating compliance with 319.207 for certain types of structures. This
statute applies to Jefferson County.
How Local Risk Assessments are Incorporated and Prioritized into Local Planning
Of the hazard risks the county has exposure to, riverine and flash flooding hazard risks are
foremost in frequency and potential magnitude in loss of people and property.
Enforcement of zoning, floodplain, stormwater ordinances, and placement of public
infrastructure provide the most effective tools to minimize known risks.
The county and municipalities recognize the danger and economic impact of severe winter
storms. Clearing of snow and ice from roadways is a main priority during these events.
The Missouri Department of Transportation has responsibility for the interstate and state
designated highways within the county. The County Highway Department and
municipalities clear their respective roadways, prioritizing known hazardous stretches of
roadways, school bus stops, and intersections in efforts to reduce accidents and maintain
the movement of people and goods.
Current Criteria Used to Prioritize Mitigation Funding
Mitigation funding is based upon the combination of expected damage, the assumed
frequency of damage, and the likelihood of death or injury to people.
Integration of Hazard Mitigation with the City/County Department’s Plans
A city or county EOP and its floodplain, zoning, subdivision, and building code ordinances
developed and enforced in an integrated fashion insure that avoidable disasters are
prevented, and the vulnerability of people and property to the effects of disasters is
reduced.
How the County Determines Cost-Effectiveness of Mitigation Programs
Cost-effectiveness is considered on a case-by-case basis; dependent upon the scope of
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